Volvo 780 Owner's Manual page 102

1989 Volvo 780
Crankcase ventilation
The engine is provided with positive crankcase ventilation which prevents crankcase gases from being released into the atmosphere. Instead,
the crankcase gases are admitted to the intake manifold and cylinders.
PCV system, B280F
The orifice nipple in the intake manifold should be cleaned every 60,000 miles (96,000 km).
Check/replace rubber hoses at the same time.
PCV system, B230F-Turbo
The orifice nipple in the intake manifold should be cleaned every 60,000 miles (96,000 km).
Check/replace rubber hoses at the same time.
pg. 101 Servicing
WARNING!
The ignition system operates at very high voltages. Special safety precautions must be followed to prevent injury. Always turn the
ignition off when:
Connecting engine test and diagnostic equipment to the vehicle (timing light, tach-dwell tester, ignition oscilloscope, etc).
Replacing ignition components e.g. plugs, coil, distributor, HT leads etc.
Do not touch any part of the ignition system while the engine is running. This may result in unintended movements and body injury.
Replacing spark plugs
The spark plugs should be changed every 30,000 miles (48,000 km). However, city driving or fast highway driving may necessitate
changing after 15,000 miles (24,000 km) of driving. When installing new plugs, be sure to fit the right type and use correct torque, see
"Specifications". When changing the plugs, check that the suppressor connectors are in good condition. Cracked or damaged connectors
should be replaced.
When changing spark plugs, clean the cables and cable terminals, also the rubber seals. If the car is driven on roads where salt is used during
the winter, coat the cables with silicone.
pg. 102 Automatic transmission
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